Standard Callendar - Van Dusen

Technical Info:

The relationship between resistance (R) and temperature (t) is generated from the Callendar-van Dusen equations.

For the temperature range -200° to 0°C;

W(t90) = R(t90)/R(0) = { 1 + At90 + Bt290 + Ct390(t90 - 100)} ...(1)

For the temperature range 0° to 661°C:

W(t90) = R(t90)/R(0) = { 1 + At90 + Bt290} ...(2)

The constants A, B, and C are determined by the properties of the platinum wire used in the construction of the detector types Pt100, F100, and D100. The wire is specially selected to give nominal values of the constants as in the table below. The listed values for Alpha, Delta, and Beta are also listed.